sympatric , allopatric and parapatric speciation

Allopatric and sympatric speciation are both methods by which new species arise. However, allopatric speciation is when species interbreed. Sympatric speciation is when several new species arise from a common ancestor.

They both are mechanisms by which new species arise

Geographic Isolation

Speciation without geographic isolation is called sympatric speciation. This type of speciation occurs when new species evolve from a common ancestor in the same geographic area. It is often driven by other factors such as ecological or reproductive isolation.